Muffler for gas-engines.



L. P. PELLBTIER.

MUFFLER FOR GAS ENGINES.

APPLICATION FILED AUG. 21, 1912.

1,084,290. Patented Jan. 13, 1914.

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Y L FPell 14 M? y w obviously necessitating a UNITED STATES Pr& TENT OFFICE.

LOUIS F. PELLETIER, OF NEW YORK, N. Y., ASSIGNOR 0F ONE-TIIIRD T0 EMIL H. FICKINGER AND ONE-THIRD T0 ERNEST F. CIGLIA, BOTH OF NEW YORK, N. Y.

MUFFLER FOR GAS-ENGINES.

To all whom it may concern:

Be it known that I, LOUIS F. PELLETIER, a

citizen of the United States, residing in New York city, in the county of New York and State of New York, have invented certain new anduseful Improvements in Muffiers for Gas-Engines, of which the following is a specification. v

This invention has for its object to pro vide an improved form of muffler device, or silencer, in which the hot gases are? first caused to travel practically throughout the length of its outer wall to be thereby reduced in temperature, and consequently, compression; the gases being then caused to return to the forward or inlet part of the muliler and pass through a large number of small openings into an inner chamber, through which they find outlet at the other end of the device.

Reduction in the temperature and tension of the exhaust gas is due almost altogether to their deflection into contact with the cold outer wall of the mufiler, and the tortuous passage and foraminous plate throughwhich they subsequently pass reduce and nullify the eddies and pulsations in said gas, and

materially aid in silencin the exhaust, but

diigher back pressure in the engine. In many places a little noise is objectionable only to the users of the engine; and I therefore provide a valvecontrolled bypass to the atmosphere in the muflier anterior to such obstructions through which the cooled exhaust can be discharged at the will of the operator, with some little noise, but with less back pressure and am thus enabled to have a silent engine, or

. a nearly silent but more eflicient engine, ac-

cording to its place of use.

In the accompanying drawings, illustrating one embodiment of my invention, Figure 1 is a longitudinal section; Fig. 2 is a section on the line 2r2 of Fig. 1; and Fig. 3 is a section on the line 3-3 'of Fig. 1.

The device is shown as comprising a casing 5, which because it is in contact with the atmosphere, is my most efiective cooling surface and is shown ascylindrical and having an inlet pipe 6 at the opening in the rear end 7. At the other end 8 an exit pipe 9 is provided, and also a by-pass or outlet valve 10 to control a by-pass 11 to the at- Specification of Letters Patent.

Patented Jan. 13, 1914.

Application filed August 21, 1912. Serial No. 716,113.

with a cone 15 located axially with and having its apex a short distance from the inlet .pipe 6 at this end. This organization forms a variably converging passage 16 between the casing 5 and the compound cone 15 and 12, the posterior portion 16 of which, about the cone 15, converges rapidly, while its outer portion 16, converges much less rapidly and will cause the gases entering through the pipe 6 to be deflected around the cone 15, and to form large whirls or rings about its point, and in their traverse of the quickly converging passage 16*, to roll upon said cone and the enveloping surface of the casing 5, to part with their heat to the latter (which is cooled by contact with the atmosphere) as they approach the less "ripidly converging portion 16 of the passage 16, about the truncated cone 12, the exhaust gases move in larger whirls, with less, actual velocity; and while traversing said passage the' whirls will gradually be nullified and the motion of the gases will be converted into axial currents along and in contact with the outer wall of the casing to be cooled'by the atmosphere engaging the casing before they reach the rear portion 17 of the casing.

The combination of the inlet pipe 6, head 7, casing 5, and compound cone 1512, constitute an efficient cooler and condenser for the exhaust gases and silencer for use where a slightly noisy exhaust would not be ob other members; and by so doing would admit the atmosphere to the interior of the compound cone 1512 and increase the gascooling efiiciency of the apparatus. But the complete organization illustrated will render the exhaust almost entirely noiseless. I

therefore provide an axially, inwardly extending, preferably conical tube 18 communicating with the pipe 9, this tube being shown as expanding inwardly, and provided with openings '20 through its inward portion to admit the gas, it being shown as having its inward end 19 secured to the cone 15. The gases issuing as an annular current from the passage 16, form whirls in the annular chamber 17, traverse it, strike its head 8 and rebound; and since they cannot find direct exit through the pipe 9 form whirls and a reverse current around the tube 18, passthrough a large number of small openings 20 in the inward end portion of the cone 18. After passing through these small openings 20 the gas will pass through the tube 18 and thence through the outlet pipe 9. By this means it will be seen that the gas on entering through the inlet will be deflected in all directions by the cone, and will first flow between the cone and the cylinder and in contact with the inner wall of the casing until it reaches the annular chamber 17 From thence the gas must pass through the tapering annular chamber 21 and in numerous small streams through the holes 20 to reach the interior of the tube 18 whose convergence will efiectively convert said small streamsof gases into a smooth and continuous current and practically noiseless final exhaust through the discharge pipe 9. But where the resulting increase of noise is not objectionable the by-pass valve 10 can be manipulated to open the by-pass 11 and put the chamber 17 in direct communication with the atmosphere so that gases can be directly discharged therefrom, thus preventing such back pressure as might be caused by forcing the gas through the opening 20 and the tube 18.

The compound cone 15-12 can be secured in position by lugs 22 connecting it with the casing. The tube 18 is secured to the end 8 of the casing and cone 15, whereby it is suitably supported.

The compound cone may be more accurately described as a conoidal deflector 1512 of graduated obliquity adapted, together with the casing 5, to form an annular converging passage 16, the convergence of which is suitably graduated. Obviously, the efficiency of the mufller could be slightly increased, with increased cost, by distributing the graduation among successive zones of the conical deflecting surface; as for example, by generating said surface by the revolution, about the axis, of a suitably curved line.

Having thus described my invention, I claim 1. An exhaust muffler for gas engines comprising an inlet, a casing of uniform sectional area and a conoidal deflector all on a common. axis, the apex of the deflectoradjacent to the inlet, a quickly-divergent conical surface adjacent to the apex, and a less divergent surface adjacent to the base of the deflector.

2. An exhaust muflier for gas engines comprising an inlet, a casing of uniform sectional area and a conoidal deflector all on a common axis, the apex of the deflector adjacent to the inlet, and on said deflector a surface of graduated obliquity, graduated from maximum obliquity adjacent to the inlet to minimum obliquity adjacent to its base.

3. An exhaust muflier for gas engines comprising an inlet, acasing of uniform sectional area and a conoidal deflector all in a common axis, said deflector comprising a cone with its apex adjacent to the inlet, and a truncated cone joined to and diverging from said cone but at a lesser angle than the divergence thereof.

1. An exhaust mufller for gas engines comprising an inlet, a casing of uniform sectional area and a conoidal deflector all in a common axis, said deflector having its apex adjacent to said inlet and its conoidal surface generated by the revolution about its axis of a line generally convex and, reckoned from the apex, gradually approaching said casing.

, 5. An exhaust muffler for gas engines comprising a casing of uniform sectional area, heads closing the ends thereof and, axially therewith, an inlet in one an a discharge through the other of said heads, a conoidal deflector-of graduated obliquity relatively to and decreasing as it approaches said casing, and a silencing tube joined to the discharge head about said discharge and extending into the deflector. l

6. An exhaust muflier for gas engines comprising a casing, heads closing the ends thereof, and, axially therewith, an inlet in one and a discharge through the other of said heads, a conoidal deflector of graduated obliquity relatively to and decreasing as it approaches said casing, a truncated cone joined to the discharge head about said diseharge extending into the deflector, and a valve controlled by-pass between the interior of said casing and the atmosphere.

7 An exhaust muffler for gas engines comprising a casing, heads closing the ends thereof, and, axially therewith, an inlet in one and a discharge through the other of said heads, a conoidal deflector of graduated obliquity relatively to and decreasing as it approaches said casing, a truncated cone joined to the discharge head about said discharge extending into the deflector, and a galic le controlled by-pass in the discharge- 8. An exhaust muifler for gas-engines com prising an inlet, a casing and a conoidal deflector all on a common axis, the apex of the deflector adjacent to the inlet, a quickly di- Vergent conical surface adjacent to the apex vergent conical surface adjacent to the apex 10 and a less divergent surface ad'acent to the and the less divergent surface adjacent to base of the deflector and forming with the the base of the deflector and forming with casing a passage converging toward its disthe casing a passage converging gradually charge. toward its discharge.

9. An exhaust mufller for gas-engines com LOUIS F. PELLETIER prising an inlet, a casing and a conoidal de- Witnesses: flecto'r all on a common axis, the apex of the x H. D. PENNEY,

deflector adjacent to the inlet, a quickly di- FRED. J ..DOLE. 

